#include <fstream>
std::ifstream fin("text.in");
std::ofstream fout("text.out");

bool estelitera(char C)
{
    return (C<='z'&&C>='a')||(C<='Z'&&C>='A');
}

int main()
{
    char C,LC='-';
    int NrLitere=0;
    int NrCuvinte = 0;
    while ((C=fin.get())&&C!=EOF)
    {
        if (estelitera(C))
        {
            NrLitere++;
        } else if (estelitera(LC))
        {
            NrCuvinte++;
        }
        LC=C;
    }
    if (estelitera(C)) NrCuvinte++;
    fout << NrLitere/NrCuvinte;
}